its a more powerful meaning because it is racist dude this is assuredly not common for other people to do calling a black dude a nigger or a mexican person a wetback is more powerfully offensive because it goes beyond just that individual it says you are repulsive because of an inherent unchangeable part of you and everyone like you if you go around and insult people using racist slurs even if you do it to everyone you are racist your racism might be limited and you may honestly feel you arent racist in other aspects of your life but that does not suddenly make the racism here go away